CN114531308A - Get device of electricity and get electric equipment from PoE system - Google Patents
Get device of electricity and get electric equipment from PoE system Download PDFInfo
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- CN114531308A CN114531308A CN202111584486.4A CN202111584486A CN114531308A CN 114531308 A CN114531308 A CN 114531308A CN 202111584486 A CN202111584486 A CN 202111584486A CN 114531308 A CN114531308 A CN 114531308A
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- 238000001514 detection method Methods 0.000 claims abstract description 83
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses a device for taking power from a PoE system and power taking equipment, wherein the device comprises a power taking module and a power taking control module; the power taking end of the power taking module is connected between the output end of the PSE equipment and the input end of the PD equipment; the input end of the power taking control module is connected with the output end of the power taking module, the output end of the power taking control module is connected with the grounding end of the PSE equipment, the detection end of the power taking control module is connected with the output end of the PD equipment, and the power supply end of the power taking control module is connected with the power receiving end of the power taking equipment; the power take control module is configured to: when detecting that both the PSE equipment and the PD equipment meet the preset power taking condition, outputting the voltage output by the PSE equipment to the power taking equipment. The invention can realize the purpose of taking power from the PoE system without being limited to the purpose of supplying power to the power taking equipment which does not conform to the PoE standard only through the nearby PD equipment supporting the power supply expansion function, and has higher applicability.
Description
Technical Field
The invention relates to the technical field of PoE (Power over Ethernet), in particular to a device for taking power from a PoE system and power taking equipment.
Background
PoE is called Power Over Ethernet, and means that Power is supplied through an Ethernet cable, and a Power supply device can transmit data to a terminal device and can also provide direct current Power supply for the terminal device by depending on the existing Ethernet wiring foundation. PoE technology has found widespread use in ethernet devices through its convenience of not having to separately run power cords. The PoE system in the prior art comprises two parts: PSE (Power Sourcing Equipment) and PD (Power Device, powered end-point) devices.
In order to realize that power-taking equipment which does not conform to a PoE standard takes power from a PoE system, in the prior art, PD equipment near the power-taking equipment is generally used for supplying power to the power-taking equipment, namely, the nearby PD equipment firstly takes power from the PoE system and then takes the PD equipment as a power supply to supply power to the power-taking equipment, but the method requires that the power-supplying PD equipment supports a power supply expansion function, and when the power-taking equipment does not support the power supply expansion function, the power-taking equipment cannot be supplied with power, so that the method has poor applicability.
Disclosure of Invention
The invention provides a device for taking power from a PoE system and power taking equipment, and aims to solve the technical problems of how to take power from the PoE system and supply power to the power taking equipment. The device can realize getting the electricity from the PoE system, need not to be restricted to and only can supply power for the equipment of getting electricity that does not conform to the PoE standard through the PD equipment of near support power expansion function, has higher suitability.
In order to solve the above technical problem, a first aspect of the embodiments of the present invention provides a device for taking power from a PoE system, including a power taking module and a power taking control module;
the power taking end of the power taking module is connected between the output end of the PSE equipment and the input end of the PD equipment;
the input end of the power taking control module is connected with the output end of the power taking module, the output end of the power taking control module is connected with the grounding end of the PSE equipment, the detection end of the power taking control module is connected with the output end of the PD equipment, and the power supply end of the power taking control module is connected with the power receiving end of the power taking equipment;
the power take control module is configured to:
when the PSE equipment and the PD equipment are detected to meet preset power taking conditions, the voltage output by the PSE equipment is output to the power taking equipment.
Preferably, the power taking control module comprises a power taking detection module and a power supply switch module;
the power supply detection device comprises a power supply detection module, a power supply switch module, a power acquisition control module, a power supply switch module and a power supply switch module, wherein the input end of the power supply detection module is connected with the input end of the power acquisition control module, the detection end of the power supply detection module is connected with the detection end of the power acquisition control module, the output end of the power supply detection module is connected with the controlled end of the power supply switch module, the input end of the power supply switch module is connected with the input end of the power acquisition control module, the output end of the power supply switch module is connected with the output end of the power acquisition control module, and the power supply end of the power supply switch module is connected with the power supply end of the power acquisition control module.
Preferably, the electricity taking detection module comprises an identification module and a power-off control module;
the power-off detection device comprises an identification module, a power-off control module, a power-taking detection module, a power-off detection module and a power-supply detection module, wherein the detection end of the identification module is connected with the detection end of the power-taking detection module, the input end of the identification module is connected with the input end of the power-taking detection module, the output end of the identification module is connected with the controlled end of the power-off control module, the input end of the power-off control module is connected with the input end of the power-taking detection module, and the output end of the power-off control module is connected with the output end of the power-taking detection module.
Preferably, the identification module at least comprises a first interface, a resistor, a first voltage-stabilizing diode and a first switch tube;
the input end of the first interface is connected with the detection end of the identification module, the output end of the first interface is respectively connected with the first end of the resistor and the controlled end of the first switch tube, the second end of the resistor is connected with the grounding end of the PSE equipment, the cathode of the first voltage stabilizing diode is connected with the input end of the identification module, the anode of the first voltage stabilizing diode is respectively connected with the input end of the first switch tube and the output end of the identification module, and the output end of the first switch tube is grounded.
Preferably, the power-off control module at least comprises a second switching tube and a second voltage stabilizing diode;
the controlled end of the second switch tube is connected with the controlled end of the power failure control module, the cathode of the second voltage stabilizing diode is connected with the input end of the power failure control module, the anode of the second voltage stabilizing diode is respectively connected with the output end of the power failure control module and the input end of the second switch tube, and the output end of the second switch tube is grounded.
Preferably, the power supply switch module at least comprises a second interface, a third interface, a fourth interface and a third switch tube;
the input of second interface with the output of third switch pipe is connected, the output of second interface with the output of power supply switch module is connected, the controlled end of third switch pipe with the controlled end of power supply switch module is connected, the input of third interface with the input of power supply switch module is connected, the output of third interface with the power supply end of power supply switch module is connected, the input of fourth interface with the power supply end of power supply switch module is connected, the output of fourth interface with the input of third switch pipe is connected.
Preferably, the power taking module at least comprises a fifth interface;
the input end of the fifth interface is connected with the power taking end of the power taking module, and the output end of the fifth interface is connected with the output end of the power taking module.
Preferably, the identification module further comprises a diode;
the anode of the diode is connected with the controlled end of the first switch tube, and the cathode of the diode is grounded.
Preferably, when the N devices need to take power from the PoE system, the output terminal of the first power take control module is connected to the ground terminal of the PSE device or the detection terminal of the first adjacent power take control module, and the detection terminal of the first power take control module is connected to the output terminal of the PD device or the output terminal of the second adjacent power take control module;
the first power taking control module is a power taking control module of one of the N devices, the first adjacent power taking control module is a power taking control module of one device adjacent to the one device, the second adjacent power taking control module is a power taking control module of the other device adjacent to the one device, and N is greater than 1.
A second aspect of the embodiments of the present invention provides a power-taking apparatus, including the device for taking power from a PoE system according to any one of the first aspect.
Compared with the prior art, the device for taking power from the PoE system has the advantages that the device for taking power from the PoE system is designed, the power can be taken from the PoE system, the device is not required to be limited to only be capable of supplying power to the power taking equipment which does not conform to the PoE standard through the nearby PD equipment supporting the power supply expansion function, and the device has higher applicability.
Drawings
Fig. 1 is a schematic structural diagram of a device for taking power from a PoE system according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a device for taking power from a PoE system according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an identification module according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a power failure control module provided by an embodiment of the invention;
fig. 5 is a circuit schematic diagram of a power supply switch module according to an embodiment of the invention;
fig. 6 is a schematic circuit diagram of a power-taking module according to an embodiment of the present invention;
fig. 7 is a schematic view of a connection structure for a plurality of power-taking devices to take power from a PoE system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in a first aspect, an embodiment of the present invention provides an apparatus for taking power from a PoE system, including a power taking module 100 and a power taking control module 200;
the power taking end of the power taking module 100 is connected between the output end of the PSE device and the input end of the PD device;
the input end of the power taking control module 200 is connected with the output end of the power taking module 100, the output end of the power taking control module 200 is connected with the grounding end of the PSE device, the detection end of the power taking control module 200 is connected with the output end of the PD device, and the power supply end of the power taking control module 200 is connected with the power receiving end of the power taking device;
the fetch control module 200 is configured to:
and when the PSE equipment and the PD equipment are detected to meet the preset power taking condition, outputting the voltage output by the PSE equipment to the power taking equipment.
Specifically, get module 100 and be used for getting from the PSE equipment, will get the end of getting of module 100 and connect between the output of PSE equipment and the input of PD equipment, when PSE equipment is to PD equipment output voltage, can get in the voltage output circuit of PSE equipment-PD equipment. The power taking control module 200 is configured to output a voltage output by the PSE device to a power taking device when detecting that both the PSE device and the PD device satisfy a preset power taking condition. The power taking module 100 outputs a voltage acquired from a voltage output line of the PSE device-PD device to an input terminal of the power taking control module 200 through an output terminal, a detection terminal of the power taking control module 200 is connected with an output terminal of the PD device, and an output terminal of the power taking control module 200 is connected with a ground terminal of the PSE device, so that a current output by the PSE device flows back to the PSE device through the power taking control module 200 after flowing to the PD device, thereby forming a loop.
It is worth mentioning that, when detecting that the PSE device and the PD device both satisfy the preset power-taking condition, the voltage output by the PSE device is output to the power-taking device, which specifically is: when detecting that the output voltage of the PSE device is greater than a preset power supply voltage, the input end of the PD device is connected with the output end of the PSE device, and the output end of the PD device is connected with the detection end of the power taking control module 200, the voltage output by the PSE device is output to the power taking device.
In one embodiment, the power-taking control module 200 includes a power-taking detection module and a power supply switch module;
the power supply detection module comprises a power supply switch module 200, a power taking detection module, a power supply switch module and a power taking control module 200, wherein the input end of the power taking detection module is connected with the input end of the power taking control module 200, the detection end of the power taking detection module is connected with the detection end of the power taking control module 200, the output end of the power taking detection module is connected with the controlled end of the power supply switch module, the input end of the power supply switch module is connected with the input end of the power taking control module 200, the output end of the power supply switch module is connected with the output end of the power taking control module 200, and the power supply end of the power supply switch module is connected with the power supply end of the power taking control module 200.
Specifically, get electric detection module and be used for detecting whether PSE equipment and PD equipment all satisfy predetermined getting the electric condition, when all satisfying predetermined getting the electric condition, will supply power signal through the output and send to the controlled terminal of power supply switch module, after power supply switch module received the power supply signal, export the voltage that acquires from PSE equipment through the power supply terminal.
In one embodiment, the power-taking detection module comprises an identification module and a power-off control module;
the detection end of the identification module is connected with the detection end of the electricity taking detection module, the input end of the identification module is connected with the input end of the electricity taking detection module, the output end of the identification module is connected with the controlled end of the power-off control module, the input end of the power-off control module is connected with the input end of the electricity taking detection module, and the output end of the power-off control module is connected with the output end of the electricity taking detection module.
Specifically, the identification module is used for identifying whether the PD equipment keeps the connection state or not through the detection end when the PSE equipment is in the power supply state, and when the PD equipment is disconnected, the identification module sends a power-off signal to the controlled end of the power-off control module through the output end, and after the power-off control module receives the power-off signal, the power-off control module sends a power supply stopping signal through the output end so as to control the power supply switch module.
Fig. 2 is a schematic circuit diagram of a device for taking power from a PoE system according to an embodiment of the present invention.
Referring to fig. 3, in one embodiment, the identification module at least includes a first interface 1, a resistor R1, a first zener diode D2, and a first switch Q1;
the input end of the first interface 1 is connected to the detection end of the identification module, the output end of the first interface 1 is connected to the first end of the resistor R1 and the controlled end of the first switch tube Q1, the second end of the resistor R1 is connected to the ground end of the PSE device, the cathode of the first zener diode D2 is connected to the input end of the identification module, the anode of the first zener diode D2 is connected to the input end of the first switch tube Q1 and the output end of the identification module, and the output end of the first switch tube Q1 is grounded.
It should be noted that, when the PSE device detects and identifies the PD device, the detection current flows from the PSE device to the PD device, and then flows back to the PSE device through the first interface 1 and the resistor R1 in the identification module; when the PSE device performs classification authentication on the PD device, a classification current flows from the PSE device to the PD device, and then flows back to the PSE device through the first interface 1 and the resistor R1 in the identification module. Because the detection voltage and the classification voltage are small and cannot reach the tube voltage drop of the first zener diode D2, when the PSE device performs detection identification and classification identification on the PD device, the first zener diode D2 is in a cut-off state, and because a voltage exists across the resistor R1, the first switching tube Q1 is in a conducting state; when the PSE device supplies power to the PD device, the generated supply voltage is greater than the tube voltage drop of the first zener diode D2, and the first zener diode D2 is in a conducting state; when the PD device is disconnected, the voltage across the resistor R1 is 0, so the first switching tube Q1 is turned off, and since the PSE device is not powered off, the first zener diode D2 is still in a conducting state, and sends a power-off electrical signal to the power-off control module, so that each stage of the PSE device is identified. In this embodiment, the resistor R1 of the identification module adopts a small-resistance resistor R1, which ensures that detection, identification and classification identification of the PD device by the PSE device is not affected, and the first switching tube Q1 is specifically an NPN type triode.
In one embodiment, the identification module further comprises a diode D1;
the anode of the diode D1 is connected to the controlled terminal of the first switch transistor Q1, and the cathode of the diode D1 is grounded.
It should be noted that, in order to prevent the first switching tube Q1 from being damaged due to the excessive current flowing through the resistor R1, a diode D1 is additionally provided to protect the first switching tube Q1, and when a large current flows through the resistor R1, the diode D1 is turned on to share a part of the voltage, thereby protecting the first switching tube Q1.
Referring to fig. 4, in one embodiment, the power-off control module at least includes a second switching tube Q2 and a second zener diode D3;
a controlled end of the second switching tube Q2 is connected to a controlled end of the power failure control module, a negative electrode of the second zener diode D3 is connected to an input end of the power failure control module, a positive electrode of the second zener diode D3 is connected to an output end of the power failure control module and an input end of the second switching tube Q2, respectively, and an output end of the second switching tube Q2 is grounded.
It is worth to be noted that, when the PSE device performs detection, identification and classification identification on the PD device, the generated detection voltage and classification voltage are small and cannot reach the tube voltage drop of the second zener diode D3, so when the PSE device performs detection, identification and classification identification on the PD device, the second zener diode D3 is in the off state, at this time, since the first switch tube Q1 in the identification module is in the on state, the controlled end of the second switch tube Q2 is grounded, and the second switch tube Q2 is turned off; when the PSE supplies power to the PD, the generated supply voltage is greater than the tube voltage drop of the second zener diode D3, the second zener diode D3 is in a conducting state, but since the first switching tube Q1 is still in a conducting state, the second switching tube Q2 is still in a blocking state, and the supply current is transmitted to the supply switching module through the second zener diode D3; when the PD device is disconnected, because the first switching tube Q1 is cut off, the power-off electrical signal is sent to the controlled terminal of the second switching tube Q2, the second switching tube Q2 becomes a conducting state, at this time, because the PSE device is not yet powered off, the second zener diode D3 is still in a conducting state, the power supply current no longer flows to the power supply switching module, but flows to the ground terminal through the second switching tube Q2, which is equivalent to sending a power supply stop signal to the power supply switching module. In this embodiment, the second switch Q2 is embodied as an NPN transistor.
Referring to fig. 5, in one embodiment, the power supply switch module at least includes a second interface 2, a third interface 3, a fourth interface 4, and a third switch tube Q3;
the input of second interface 2 with the output of third switch pipe Q3 is connected, the output of second interface 2 with the output of power supply switch module is connected, the controlled end of third switch pipe Q3 with the controlled end of power supply switch module is connected, the input of third interface 3 with the input of power supply switch module is connected, the output of third interface 3 with the power supply end of power supply switch module is connected, the input of fourth interface 4 with the power supply end of power supply switch module is connected, the output of fourth interface 4 with the input of third switch pipe Q3 is connected.
It should be noted that when the PSE device detects, identifies and performs classification identification on the PD device, since the first zener diode D2, the second zener diode D3 and the second switching tube Q2 are all in the cut-off state, no power supply current flows to the third switching tube Q3, the voltage at the controlled end of the third switching tube Q3 is 0, and the third switching tube Q3 is in the cut-off state, the path between the second interface 2 and the fourth interface 4 is disconnected, and the device cannot form a power supply loop with the PSE device; when the PSE device supplies power to the PD device, the first zener diode D2 and the second zener diode D3 are both in a conducting state, and the second switching tube Q2 is in a blocking state, so that the power supply current flows to the third switching tube Q3, and the third switching tube Q3 is conducting, so that a path is formed between the second interface 2 and the fourth interface 4, the device and the PSE device form a power supply loop, and a power supply voltage is generated between the third interface 3 and the fourth interface 4, so as to supply power to the power supply device; when the PD apparatus is disconnected, the second switching tube Q2 becomes an on state, so the controlled terminal of the third switching tube Q3 is grounded, the third switching tube Q3 becomes an off state, the path between the second interface 2 and the fourth interface 4 is again opened, and the power supply to the power supply apparatus is stopped. In the present embodiment, the third switch Q3 is specifically an N-channel enhancement mode fet.
Referring to fig. 6, in one embodiment, the power taking module 100 at least includes a fifth interface 5;
the input end of the fifth interface 5 is connected with the power taking end of the power taking module 100, and the output end of the fifth interface 5 is connected with the output end of the power taking module 100.
Referring to fig. 7, in one embodiment, when N devices need to take power from the PoE system, the output terminal of the first power take control module 200 is connected to the ground terminal of the PSE device or the detection terminal of the first adjacent power take control module 200, and the detection terminal of the first power take control module 200 is connected to the output terminal of the PD device or the output terminal of the second adjacent power take control module 200;
the first power acquisition control module 200 is a power acquisition control module 200 of one of the N devices, the first adjacent power acquisition control module 200 is a power acquisition control module 200 of one device adjacent to the one device, the second adjacent power acquisition control module 200 is a power acquisition control module 200 of another device adjacent to the one device, and N > 1.
It should be noted that, in fig. 7, a plurality of power-taking devices are connected in series between the PSE device and the PD device, and each power-taking device includes the device for taking power from the PoE system provided in the embodiment of the present invention, so that it is equivalent to that a plurality of devices for taking power from the PoE system are connected in series between the PSE device and the PD device. When a plurality of devices are connected in series between the PSE equipment and the PD equipment, a plurality of resistors R1 are connected in series between the PSE equipment and the PD equipment, but the resistance value of the resistor R1 is smaller, so that the detection identification stage and the classification identification stage of the PSE equipment can not be influenced while the number of power taking equipment is increased.
The device for taking power from the PoE system provided by the embodiment of the invention has the following beneficial effects:
(1) the power can be taken from the PoE system, the power can be supplied to the power taking equipment which does not conform to the PoE standard only through the nearby PD equipment supporting the power supply expansion function, and the high applicability is achieved.
(2) A plurality of devices for taking power from the PoE system provided by the embodiment of the invention can be connected in series between the PSE equipment and the PD equipment, and power supply is supported for a plurality of power taking equipment.
(3) When the PD equipment is disconnected, the device for taking power from the PoE system provided by the embodiment of the invention can identify the device in time and actively stop supplying power to the power taking equipment, so that the device has higher safety.
(4) The circuit structure in the device for taking power from the PoE system provided by the embodiment of the invention is simple, the manufacturing cost is low, and meanwhile, only one PoE line from PSE equipment to PD equipment needs to be occupied, so that wiring resources are saved.
In order to better embody the beneficial effects of the embodiment of the present invention, the operation of the embodiment of the present invention is described below with reference to fig. 2.
After the PD equipment is accessed to a PoE line:
(1) a detection and identification stage: the detection current output by the PSE device flows to the PD device through the fifth interface 5, and then flows back to the PSE device from the first interface 1 through the resistor R1 through the second interface 2, and the detection current causes a voltage to be generated across the resistor R1, so that the first switching transistor Q1 is turned on. At this time, the detection voltages are both smaller than the tube voltages of the first zener diode D2 and the second zener diode D3, and the first zener diode D2 and the second zener diode D3 are both turned off. At this time, the second switching tube Q2 is turned off, and the third switching tube Q3 is turned off. Meanwhile, the resistor R1 is small, so that detection and identification of the PD equipment by the PSE equipment are not influenced.
(2) And (3) grading and identifying stage: the classification current output by the PSE device flows to the PD device through the fifth interface 5, and then flows back to the PSE device from the first interface 1 through the resistor R1 through the second interface 2, and because the classification current is large, the diode D1 is turned on, and the first switching tube Q1 is protected. At this time, the stepped voltage is still smaller than the tube voltage of the first zener diode D2 and the second zener diode D3, the first zener diode D2 and the second zener diode D3 are both turned off, the second switching tube Q2 is turned off, and the third switching tube Q3 is turned off. Meanwhile, the resistor R1 is small, so that the classification and identification of the PD equipment by the PSE equipment can not be influenced.
(3) And (3) a power supply stage: the power supply current output by the PSE device flows to the PD device through the fifth interface 5, and then flows back to the PSE device from the first interface 1 through the resistor R1 through the second interface 2, and because the power supply current is large, the diode D1 is turned on, and the first switching tube Q1 is protected. At this time, the power supply voltage is greater than the tube voltage of the first zener diode D2 and the second zener diode D3, and the first zener diode D2 and the second zener diode D3 are turned on. At this time, the first switching tube Q1 is turned on, so the second switching tube Q2 is turned off, the power supply current flows to the controlled end of the third switching tube Q3 through the second zener diode D3, so the third switching tube Q3 is turned on, a path is formed between the second interface 2 and the fourth interface 4, and therefore, the voltage is output between the third interface 3 and the fourth interface 4 for the power supply device to use.
(4) A power-down stage: when the PD device is disconnected from the PoE line, since no voltage exists at two ends of the resistor R1, the first switching tube Q1 is turned off, and since the PSE device is not powered off at this time, the first zener diode D2 and the second zener diode D3 maintain a conducting state, the second switching tube Q2 changes into a conducting state, so that the third switching tube Q3 changes into a blocking state, a path between the second interface 2 and the fourth interface 4 is disconnected, and an output voltage between the third interface 3 and the fourth interface 4 is stopped, so that the power-taking device is powered down, and then the PSE device is controlled to be powered off.
A second aspect of the embodiments of the present invention provides a power-taking apparatus, including a device for taking power from a PoE system according to any one of the embodiments of the first aspect.
It should be noted that the first interface 1, the second interface 2, and the fifth interface 5 of the apparatus are used as external interfaces of power-taking devices for connecting with external devices, and the third interface 3 and the fourth interface 4 of the apparatus are used as internal interfaces of the power-taking devices for outputting power to the power-taking devices. The third interface 3 and the fifth interface 5 are directly connected inside the power-taking equipment, the second interface 2 and the fourth interface 4 are connected through a switching tube, and when the switching tube is switched on, the second interface 2 and the fourth interface 4 are directly connected.
In summary, the device for taking power from a PoE system and the power taking device provided by the embodiments of the present invention have the following beneficial effects:
(1) the power-taking device can be used for taking power from a PoE system, and power supply for the power-taking device which does not conform to the PoE standard can be realized only through the nearby PD device supporting the power supply expansion function, so that the power-taking device has higher applicability.
(2) A plurality of devices for taking power from the PoE system and power taking equipment provided by the embodiment of the invention can be connected in series between the PSE equipment and the PD equipment, and power supply is supported for the plurality of power taking equipment.
(3) When the PD equipment is disconnected, the device for taking power from the PoE system and the power taking equipment provided by the embodiment of the invention can recognize in time and actively stop supplying power to the power taking equipment, so that the device has high safety.
(4) The circuit structure in the device for taking power from the PoE system provided by the embodiment of the invention is simple, the manufacturing cost is low, and meanwhile, only one PoE line from PSE equipment to PD equipment needs to be occupied, so that wiring resources are saved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A device for getting electricity from a PoE system is characterized by comprising an electricity getting module and an electricity getting control module;
the power taking end of the power taking module is connected between the output end of the PSE equipment and the input end of the PD equipment;
the input end of the power taking control module is connected with the output end of the power taking module, the output end of the power taking control module is connected with the grounding end of the PSE equipment, the detection end of the power taking control module is connected with the output end of the PD equipment, and the power supply end of the power taking control module is connected with the power receiving end of the power taking equipment;
the power take control module is configured to:
when the PSE equipment and the PD equipment are detected to meet preset power taking conditions, the voltage output by the PSE equipment is output to the power taking equipment.
2. The device of claim 1 in which the power take control module includes a power take detection module and a power switch module;
the power supply detection device comprises a power supply detection module, a power supply switch module, a power acquisition control module, a power supply switch module and a power supply switch module, wherein the input end of the power supply detection module is connected with the input end of the power acquisition control module, the detection end of the power supply detection module is connected with the detection end of the power acquisition control module, the output end of the power supply detection module is connected with the controlled end of the power supply switch module, the input end of the power supply switch module is connected with the input end of the power acquisition control module, the output end of the power supply switch module is connected with the output end of the power acquisition control module, and the power supply end of the power supply switch module is connected with the power supply end of the power acquisition control module.
3. The device of claim 2 in which the power take detection module includes an identification module and a power down control module;
the power-off detection device comprises an identification module, a power-off control module, a power-taking detection module, a power-off detection module and a power-supply detection module, wherein the detection end of the identification module is connected with the detection end of the power-taking detection module, the input end of the identification module is connected with the input end of the power-taking detection module, the output end of the identification module is connected with the controlled end of the power-off control module, the input end of the power-off control module is connected with the input end of the power-taking detection module, and the output end of the power-off control module is connected with the output end of the power-taking detection module.
4. The device of claim 3 in which the identification module includes at least a first interface, a resistor, a first zener diode, and a first switch tube;
the input end of the first interface is connected with the detection end of the identification module, the output end of the first interface is respectively connected with the first end of the resistor and the controlled end of the first switch tube, the second end of the resistor is connected with the grounding end of the PSE equipment, the cathode of the first voltage stabilizing diode is connected with the input end of the identification module, the anode of the first voltage stabilizing diode is respectively connected with the input end of the first switch tube and the output end of the identification module, and the output end of the first switch tube is grounded.
5. The device of claim 3 in which said power-down control module includes at least a second switching transistor and a second zener diode;
the controlled end of the second switch tube is connected with the controlled end of the power failure control module, the cathode of the second voltage stabilizing diode is connected with the input end of the power failure control module, the anode of the second voltage stabilizing diode is respectively connected with the output end of the power failure control module and the input end of the second switch tube, and the output end of the second switch tube is grounded.
6. The apparatus according to claim 2 for taking power from a PoE system, wherein said power switch module comprises at least a second interface, a third interface, a fourth interface and a third switch tube;
the input of second interface with the output of third switch pipe is connected, the output of second interface with the output of power supply switch module is connected, the controlled end of third switch pipe with the controlled end of power supply switch module is connected, the input of third interface with the input of power supply switch module is connected, the output of third interface with the power supply end of power supply switch module is connected, the input of fourth interface with the power supply end of power supply switch module is connected, the output of fourth interface with the input of third switch pipe is connected.
7. The device of claim 1, wherein said power take module includes at least a fifth interface;
the input end of the fifth interface is connected with the power taking end of the power taking module, and the output end of the fifth interface is connected with the output end of the power taking module.
8. The device for extracting power from a PoE system as recited in claim 4, wherein said identification module further comprises a diode;
the anode of the diode is connected with the controlled end of the first switch tube, and the cathode of the diode is grounded.
9. The device for extracting power from a PoE system as recited in claim 1, wherein when N of said devices need to extract power from a PoE system, an output terminal of a first power extraction control module is connected to a ground terminal of said PSE device or a detection terminal of a first neighboring power extraction control module, and the detection terminal of said first power extraction control module is connected to an output terminal of said PD device or an output terminal of a second neighboring power extraction control module;
the first power taking control module is a power taking control module of one of the N devices, the first adjacent power taking control module is a power taking control module of one device adjacent to the one device, the second adjacent power taking control module is a power taking control module of the other device adjacent to the one device, and N is greater than 1.
10. An electricity taking device, characterized in that the electricity taking device comprises the apparatus for taking electricity from a PoE system according to any one of claims 1 to 9.
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